混凝土大坝裂缝光纤监测关键性基本问题的协同研究

灵敏性与复用能力是基于瑞利散射的混凝土坝裂缝光纤监测两个最为关键、且相互约束、不可分割的基本参量。基于单裂缝混凝土模型试验，对大坝裂缝光纤监测中采用的光纤传感技术的灵敏性和复用能力进行了定量化协同研究，得到了传感光纤在大坝安全监控缝宽控制范围内、对应于同一光信号衰减规律的灵敏性和复用能力与裂缝宽度关系曲线，为光纤传感在我国大型水电工程裂缝监测中的进一步研究和应用提供了基本参照。

Integrated study on key basic problems of fiber optic monitoring cracks in concrete large dams

The sensitivity and multiplexing capability are two restricted each other inseparable key basic parameters of fiber optic monitoring cracks in concrete dams based on Raleigh scattering. Based on single-crack experiments for concrete samples, the integrated quantitative study on the sensitivity and multiplexing capability of the fiber optic sensing techniques adopted in large dam crack monitoring is conducted. The relationships of the sensitivity and multiplexing capability with crack width corresponding to the same optic attenuation laws of the sensing optic fibers within the range of the controlled craack width for large dam safety monitoring and control are obtained. The basic reference for the further application and its research of fiber optic crack sensing and crack monitoring in large hydroelectric engineering is provided.